Electrical soldering-iron.



No. 64i,02l. Patented an. 9, 5909. E. KUHN.

ELECTRICAL SDLDEBING ERDN.

(Application filad Jan. 80, 1899.)

(No Model.)

WITNESSES. I :1. i 17v VENTOR.

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1 UNITED STATES PATENT Grinch...

ROBERT KUHN, OF DETROIT, MICHIGAN.

ELECTRICAL SOLDERlNG-IRON.

SPECIFICATION forming part of Letters Patent No. 641,021, dated January9, 1900.

Application filed January 30, 1899. Serial No. 703,818. (No model.)

To aZZ whom it may concern:

Be it known that 1, ROBERT KUHN, a citizen of the United States,residing at Detroit, in the county of Wayne, State of Michigan, haveinvented certain new and useful Improvements in ElectricalSoldering1rons; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

This invention relates to electrical soldering-irons; and it consists inthe construction and arrangement of parts hereinafter fully set forth,and pointed outparticularly in the claims.

The objects of the invention are to facilitate the heating of the ironand lessen the consumption of the current by locating theresistance-coil within the working point of the tool, to provide forfirmly anchoring the resistance-coil within the copper point of the tooland to seal it hermetically therein, thereby lessening the liability ofthe burning out of the coil, and to provide for a ready removal of thepoint of the tool and the replacing of another point, so that in casethe resistancecoil becomes defective the soldering-iron may be continuedin use by simply removing the old point and replacing it with a new one.These objects are attained by the construction illustrated in theaccompanying drawings, in which-- Figure 1 is an elevation of a completesoldering-iron involving my improved features. Fig. 2 is an enlargedlongitudinal section through the point of the iron, as on line 2 2 ofFig. 1, other parts being broken away. Fig. 3 is a like sectional view,as on line 3 3 of Fig. 2, the resistance-coil,with itsconductorconnections and the sealing-cement,being omitted. Fig. 4 is atransverse section,as on line 4; 4 of Fig. 2.

Referring to the letters of reference, A designates the handle of thetool, which may be of any suitable construction and through which theelectrical conductors a pass in any suitable manner.

The point B of the soldering-iron comprises a copper shell having in theupper portion thereof a cylindrical chamber 1), which terminates at thesolid part of the shell and in which the resistance-coil O is located,which is of ordinary winding insulated in a manner well understood inthe art, the ends of the wires of said coil being secured to thebinding-screws c c, which are screwed into the rearwardly-projectingconducting-pins d, which pass through the insulating-bushings d,locatedin the circular copper plate D,which fills'the diameter of the chamberZ) in the copper shell. To support the resistance-coil centrally withinsaid chamber, a large central pin E is employed, which is adapted toscrew into the solid portion of the point within said chamber andproject centrally therefrom. The resistance-coil surrounds the pin E andis held in place thereby through the medium of the filling of cement F,which is placed within the center of said coil around said pin, wherebythe coil is maintained centrally within said chamber, so as to be freefrom contact with the walls thereof, as shown in Fig. 2, therebyobviating the compression of and injury to the resistance-coil through asudden contraction of the outer'shell.

To hermetically seal the resistance coil within the chamber of thecopper shell, a filling G of cement is placed within the outer end ofsaid chamber upon the copper plate D and around the pins 01 and centralpin E, whereby said parts are firmly retained in place and the chamberin the shell so sealed as to obviate the entrance of air to the coil 0,thereby decreasing the liability of the burning out of said coil.

H designates a section of the point of the tool which is separated fromthe section B by means of the interposed layer of asbestos I, thepurpose of which is to prevent the heat from the point of the iron beingconducted into the handle of the tool. This section II is in the shapeof an inverted cup, and the center-pin E passes through said interposedlayer of asbestos and into a central opening 6 in the bottom of saidsection H. The outer end of the pin E is provided with a V-shaped groovee,into which the screw c",which passes diametrically through the bottomof said cup section, as shown in Fig. 3, is adapted to enter, wherebysaid section H becomes securely united to the section B.

The contact-pins d project into the recess in said cup-section and areadapted to enter the socket-pins f, which project from the bottom ofsaid cup-section in line with said pins, but which are insulated fromthe bottom of said section and receive the contact-screws t', which arescrewed therein and to which the conductors a are attached, whereby thecontinuity of said conductors is established through the tool to theresistance-coil O in the point thereof.

J designates a second layer of asbestos, which is interposed between thebotton of the cup-section H and the flanged portion K of the stem K ofthe handle. This second layer of asbestos is to offer additionalresistance to the passage of any heat into the handle of the tool. Thecup-section H is attached to the flanged portion K of the stem of thehandle by means of the screws g, (see Fig. 3,) which pass through thebottom of said cup portion and through the interposed layer of asbestosand screw into the flanged portion K of the handle.

The connection between the pins d and the recessed or hollow pins f issuch that said pins may be readily separated, so that upon removing thescrew e, which engages the V- shaped groove in the end of the largecenterpin E, the point B of the tool may be readily removed and a likepoint quickly replaced and again secured in working position by means ofthe screw 8. This arrangement requires only the changing of the point ofthe tool should the coil therein become burned out, thereby effecting agreat saving over the ordinary construction,in which the whole tool mustbe discarded should accident happen to the resistance-coil.

Having thus fully set forth my invention, what I claim is- 1. In anelectrical soldering-iron, the combination with the handle, of thehollow point, a resistance-coil located within said hollow point, theconductors passing through the handle terminating in hollow contacts,contact-pins leading from the coil adapted to enter the hollow contactsof the conductors, and means for detachably securing the hollow pointwith its resistance-coil to the complementary portion of the tool.

2. In an electrical soldering-iron, the combination with the handlecarrying the conductors, the removable hollow point carrying theresistance-coil, detachable contacts connecting said coil with saidconductors, a central pin extending from the hollow in said pointthrough said coil, and a screw passing through the side of the iron andengaging said pin.

In testimony whereof I sign this specilioation in the presence of twowitnesses.

ROBERT KUIIN.

Vitnesses:

E. S. WHEELER, M. A. ll/IARTIN.

